Infiniband PCIe card preventing boot in one server but not another

Just saw this thread. I have a similar(-ish) problem with a Dell-branded ConnectX-3 (312 dual port). It works in an Supermicro X11SSi-ln4f but not on a gigabyte G87 UD3H. Machine wouldn't even boot. Crossflashing to the latest Mellanox firmware screwed up the LED's but alas no improvement in booting on the Supermicro. I wasn't aware of the SMbus pin masking. Maybe I'll give that a shot.

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Which motherboard does it not work on? Did you try increasing the BAR space size?

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